Jake Paul is now the No. 14 cruiserweight in the WBA rankings ... and you know who's pissed about that?? The guy who was the No. 14 cruiserweight heading into this week -- 20-0 fighter Craig Parker.
TMZ Sports spoke with the now-No. 15-ranked boxer about the development ... and he said, quite frankly, it's "disgusting news to me" because in his opinion, he hasn't paid his dues.
"For him just to take a position that guys like me that struggled to find ways to the gym and .